I've revived the above texts from my friend simply called "me". Apparently the text messages tell you everything you need to know. Arrrrrrgh! I told him not to mess with people.
The kidnapper is a card game.
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Building off u_ndefined's answer:
The person is in Washington D.C.
Where the king stays:
The King, aka Elvis Presley is prominently on display at the Smithsonian National Museum of American History
The one who kills our children:
Elvis is famous for revolutionizing the minds of America's youth thus, "killing" the children from the perspective of former generations. According to wikipedia:
Presley, more than anyone else, gave the young a belief in themselves as a distinct and somehow unified generation—the first in America ever to feel the power of an integrated youth culture.